Yaskawa Z1000U - Manual (Page 201)

HOA Keypad Display Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Torque Detection Level 2 (L6-05) for longer than the
allowable time (L6-06).
HOA Keypad Display Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
HOA Keypad Display Fault Name
oPr
HOA Keypad Connection Fault
The HOA keypad has been disconnected from the drive.
An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the keypad is disconnected (o2-06 = 1).
• The Run command is assigned to the keypad (b1-02 = 0 and OFF mode has been selected).
Cause Possible Solution
External operator is not properly connected to the
drive
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Reconnect the operator and reapply
drive input power.
HOA Keypad Display Fault Name
ov
Control Circuit Overvoltage
Voltage in the control circuit has exceeded the overvoltage level.
• For 200 V class drives: approximately 450 V
• For 400 V class drives: approximately 900 V
Cause Possible Solution
HOA Keypad Display Fault Name
SCF
Safety Circuit Fault
Safety Circuit Fault is detected.
HOA Keypad Display Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
Cause Possible Solution
Parameters related to Speed Search are set to the
wrong values
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
The motor is coasting in the opposite direction of
the Run command
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Digital Operator Display Fault Name
SoH Snubber Discharge Resistor Overheat
Digital Operator Display Fault Name
SrC
Phase Order Detection Fault
The phase rotation direction for the input power supply changed.
Digital Operator Display Fault Name
Srr
Internal Resistance Fault
An operation failure occurred in the snubber discharge resistor circuit.
HOA Keypad Display Fault Name
STo
Motor Pull Out or Step Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
Cause Possible Solution
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 201
5
Troubleshooting